Perpetual calendar.



-UNITED,S'IQMLESJPia-19311811? fornron.

JOSEPH GUIDINGER, OF LOS ANGELES, CALIFORNIA.

' PERPETUAL CALENDAR.

Patented June 19, 1906.

A li ti fil d January 3, 1996. Serial No. 239,320.

To all whom it may concern;

.- Be it known that I, JosEPH GU'ID'INGER, a

. citizen of the UnitedStates, residing at Los Angeles, in the county of Los Angeles and 5 State of California, have invented a new and useful Perpetual Calendar, of which'the following is a specification.

The main object of this invention is to provide a device of small sizefor example, one that can be carried inthe pocket, and which can be used to determine by mere inspection the monthly dates corresponding to given week-da 5 throughout a'series of years.

A furt or object of the invention 18130 provide a device of this character. of extreme cheapness and simplicity of operation.

' Another object of the invention is to provide a calendar of this nature which is adapt-I ed to be used as an advertising medium.

The accompanying drawingsillustrate the invention.

-Figure 1 is a front viewof the calendar. Fig. 2 is a rear view thereof. Fig. 3 is a section on line 90 m in Fig. 1.

' The device" comprises two relatively rota- "table members 1 and 2, The member 1 may be formed as a disk of cardboard or pasteboard'having a central circular opening 3, within which the'member 2 is rotatably sup- 3O cardboard or'pasteboarddisk of. a size to fit and turn within the said opening or within a ring 4 having its edges 5 upset and extending over theedges of said opening, soas to re tain the member 2 in place within and on the member 1. The inner member is smaller than the opening in' the outer member, and the ring is formed with continuous flanges extending outwardly over the outer member and inwardly over the inner member, on both sides of said members, 'theringbeing a single iece bent. to form these flanges. On the ront face of one of the said members 1 2'- for example, the member 1are imprinted marks 6, designating a series, of years, in this case running from the year 1902 to the year 1912. The other member-for example, the member 2is provided with marks 7, designating the months, or grou s of months in the year. j These faces of t e members are. herein termed the front faces, inasmuch as the devicewill'be setwith reference to the marks on these faces and the day then determined by, inspection of the marks on the rear 55 faces. 'L; The rear face of one member isprovided ported. The member 2 may consist of a.

with seven groups of marks 8, designating the 7 days of the month, the numerals correspond- .ing to said days from 1 to 31 being distributed throughout these grou s, as hereinafter described. The rear face the other member is provided with marks 9, desi nating the seven days of the week. It will t us be seen that all the various, marks are so arranged that each group occupies one-seventh of the circumference, the marks or groups of marks being angularly equidistant. In regard to the days of theweek and the divisions or groups into whichthe days of the month are divided, this division into seven elements follows the usual calendar arrangement. The separation of the years into seven div slons 1s made to conform to the arrangement by sevens on the reverseside, and the division of the months into groups is effected by associating certain months together to form groups, themembers of each group conforming identically as regards the correspondence of Weekdays with given months and daysin a given year, regard being had to the natural order of succession of the week-days on the reverse side. v

In explanation of the proper order and ar rangement of the marks on the calendar shown in the drawings the following is submitted. By analytical examination of calendars in common use covering a period of 7 several years it was found that- First. The days of the week always follow each other in regular ordernarhely, Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

Second. The days of the month are grouped into seven sections, the figures in each section always being the same-namely,

8 N 9 1O 11 12 13 14 15 .16 17 18 '19 20 21 22 23 24 25 26 27 28 29 3O 31 except that in months having less than thirty-one days the day or days short are omitted.

9 Third. The months of the year are grouped into seven sections, the months of any group always beginning :on the same day of the week for any given year. For example, (a) Janua and October of 1905 begin on Sun day. blMay of 119075 begins on Monday.

(0) August of 1905 begins on Tuesday. (01) February, March, and November of 1905 begin on Wednesday. (6) June of 1905 begins IIO 40 above referred to.

on Thursday. (f) September and December of 1905 begin on Friday. (g) April and July of 1905 begin on Saturday, except that in leap-years the months of January and Febru- 5 ary begin the previous day of the weeki. e.,

January of 1904 began on Friday, while October began on Saturday, and February of 1904 began on Monday, while March and November began on Tuesdaythis from the To fact that the 29th day of February carries the balance of the year, to and including the last day of February of the succeeding year, one day in the week farther ahead.

Fourth. Any month of each succeeding year always begins on the succeeding day of the week it began the previous year'b. e. May of 1904 began on Sunday. In 1905- it will begin on Monday. In 1906 it will beginon Tuesday, andso on, except that the 29th day of February in leap-years, to and including the last day of February of the succeedmg year, carries it one day forward. Thus May of 1907 will begin on Wednesday, while in 1908 it will begin on Friday. Each leapyear may therefore be divided into two portions, the first two months conforming to the law of the preceding year and the succeeding months of the leap-year conforming to the new law, WhlCh' continues in effect until the next leap-year; The marks designating leapyearssuchas 1904, 1908, &c.-are' therefore repeated in two adjacent columns and a special character, such as applied to that one of said marks which: is to be used for 3 5 the first two months of the year.

given on member 2.

My invention is not limited to the specific arrangement of the marks shown so long as the principles of operation above set forth are observed.

The device is shown on an enlarged scale in the drawings for better illustration. It will be understood that it can be made much smaller than therein shown.

The device being sufficiently small to be carried in the pocket and sufficiently cheap to be prepared in large numbers at small cost, it forms a desirable advertising medium, the advertising matter (indicated at 10) being placed on either or both faces of either or both members 1 and 2for example, in the blank space around the outer portion of the front face of member 1 or between the numeral-columns on the rear face of member 1 or within the monthly designations on the 6 5 rear face of member 2.

What I claim isv v 1. A perpetual calendar comprising two relatively rotatable members, the corresponding faces of the members being provided on one side respectively with groups of marks designating the months and the years, and on the other side with marks designating respectively the days of the week and the dates of the month.

2. A calendar comprising two relatively rotatable members, one of the members carrying on itsfront face marks designating the months arranged in seven angularly-equidistant groups, and the other member carrying on its front face marks designating the years arranged in seven equidistant groups; and one of the members carrying on its rear face angularly-equidistant marks designating the seven days of the week, and the other member carrying on its rear face marks designating the days of the month arranged in sevenangularly-equidistant groups, the numbers increasing progressively by seven in each group, and increasing from one group to the next by a difference of one.

3. A calendar comprising an outer member, an inner disk member rotatable within the outer member, the front faces of the said members being provided respectively with seven angularly-equidistant groups of marks designating years, and with angularly-equidistant groups of marks designating months, and the rear faces of the res )ectivemembers being provided with angularly-equidistant groups of marks designating the days of the month, and with angularlyequidistant marks designating the days of the week.

4. A calendar comprising two relatively rotatable members, one of the members carrying on its rear face angularly-equidistant marks designating the seven days of the week, and on the front face marks designating the months arranged in seven angularlyequidistant groups, and the other member carrying on its rear face, marks designating the days of the month arranged in seven angularlyequidistant groups, the numbers increasing progressively by seven ineach group and increasing from one group to the next by a difference of one,said other'member carrying on its front face marks designating the years arranged in seven equidistant groups, the marks designating leap-years being duplicated in adjacent groups and one of said diupli'cate marks having a special designatingmark.

5. A perpetual calendar composed of an outer member, and a disk member revolving within said outer member, with the years and months on the front faces of said members arranged in relation to the days of the month and days of the week on the back faces, so that revolving the disk and thus setting a given month and year to register opposite each other will automatically set its back face'to properly register the days of the week over the columns of days of the month for that particular month of that year.

6. A calendar comprising an outer member having an opening, a ring in said 0 ening, and a disk member within the ring, t e ring having continuous flanges on both sides of said members extending outwardly over the outer member and inwardly over the inner member. V

7. A calendar comprising an outer member having an opening, a ring in said opening, and a disk member within the ring, said inner member being smaller diameter than the opening in the outer member, and the said 15 ring being bent on both sides of said members to form flanges extending outwardly over the outer member and inwardly over the inner member on both sides thereof.

In testimony whereof I have hereunto set 20 my hand, at Los Angeles, California, this 27th day of December, 1904.

JOSEPH GUIDINGER.

In presence of- A. P. KNIGHT, JULIA TOWNSEND. 

